121638238 has 8 divisors (see below), whose sum is σ = 188749080. Its totient is φ = 58721880.

The previous prime is 121638227. The next prime is 121638269. The reversal of 121638238 is 832836121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048548 + ... + 1048663.

It is an arithmetic number, because the mean of its divisors is an integer number (23593635).

Almost surely, 2^121638238 is an apocalyptic number.

121638238 is a deficient number, since it is larger than the sum of its proper divisors (67110842).

121638238 is a wasteful number, since it uses less digits than its factorization.

121638238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097242.

The product of its digits is 13824, while the sum is 34.

The square root of 121638238 is about 11028.9726629455. The cubic root of 121638238 is about 495.4768563948.

The spelling of 121638238 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, two hundred thirty-eight".